Camponotus pennsylvanicus. Doesn't look like you got the colony's queen. These are unmated queens and males, along with some workers. The rest are probably underground. At least they will be one of the earlier ants to fly next summer.

If you can take better photographs and provide a measurement, then there will be more to work with. The fact that there's more than one petiole means that she's not related to the Lasius you found her with.

are all social parasites the same genus as the species as their host? For the most part, yes, but the taxonomy hasn't quite caught up with this trend. The likes of Polyergus and Strongylognathus are still distinct genera, even though they are they are so closely related to their host species. With ...